Q. The modulation index is, if fm = 500 Hz, Δf = 2.25 kHz

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Q. Which of the following is true in a tape recorder?

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Q. In a high speed modem the data rate handled is about

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Q. Trinitron is a monochrome picture tube.

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Q. The first pulse in a TV remote control is

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Q. If the ratio of ac to dc load impedance of a diode detector is low, the result will be

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Q. If D is mouth diameter of a paraboloid reflector, its directivity is proportional to

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Q. A noiseless 3 kHz channel can't transmit binary bit at the rate

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Q. In an AM wave the carrier and one of the side bands is suppressed. If m = 1, the percentage saving in power is

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Q. Assertion (A): An electronic tuner uses varactor diode

Reason (R): The capacitance of a varactor diode depends on the magnitude of reverse bias.

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Q. A superheterodyne receiver is to operate in the frequency range 550 kHz - 1650 kHz, with the intermediate frequency of 450 kHz. Let R = Cmin/Cmax denote the required capacitance ratio of the local oscillator and I denote the image frequency (in kHz) of the incoming signal. If the receiver is tuned to 700 kHz, then

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Q. In a tape recorder the output from RF oscillator is given to

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Q. A + 1.9 lens has a focal length of 25 mm. The diameter of lens is about

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Q. Which of the following terms are applicable to troposcatter propagation?

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Q. If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if fm = 500 Hz, Δf = 2.25

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Q. In TV scanning sequence of lines is

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Q. In equally tampered scale, frequency of each tone equals the frequency of lower adjacent tone multiplied by

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Q. A carrier is modulated by two modulating waves A and B having modulation indices of 0.6 and 0.8 respectively. The overall modulation index is

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Q. A communication channel disturbed by additive white, Gaussian noise has a bandwidth of 4 kHz and SNR of 15. The highest transmission rate that this channel can support (in k bits/sec) is

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Q. Which of the following microphones is used as a standard for calibration?

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